<template>
  <view>
    <my-search :background="'#C00000'" :redus="20" @click='gotoSearch()'></my-search>
   
   
   
   <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key='i'>
               <view @click="changeActive(i)" :class="['left-scroll-view-item', i === active ? 'active' : '']">{{item.cat_name}}</view>
        </block>
   

      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <!-- 二级分类 -->
        <view class="cate-lv2" v-for="(item2,i2) in cateList2" :key="i2" >
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key='i3' @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon" mode=""></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  
  // 导入自己封装的 mixin 模块
  import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
    // 将 badgeMix 混入到当前的页面中进行使用
    mixins: [badgeMix],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        sq:[{name:'2'},{name:'3'},{name:'4'}],
        // 二级分类
        cateList2:[],
        // 二级分类右侧滑块切换回到顶部
        scrollTop:0
      };
    },
    onLoad(){
      const  info = uni.getSystemInfoSync()
      this.wh = info.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        // 发起请求
      const { data: res } = await uni.$http.get('/api/public/v1/categories')
      // 判断是否获取失败
      if (res.meta.status !== 200) return uni.$showMsg()
      // 转存数据
      this.cateList = res.message
      this.cateList2 = res.message[this.active].children
      },
      changeActive(i){
        this.active = i,
        this.getCateList(),
        this.scrollTop = this.scrollTop ===0 ? 1 : 0
      },
      gotoGoodsList(item3){
         uni.navigateTo({
           url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
         })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  
  .scroll-view-container{
    display: flex;
    
    .left-scroll-view {
      width: 120px;
      
      .left-scroll-view-item {
        line-height: 60px;
        background-color: #F8F8F8;
        text-align: center;
        font-size: 12px;
        &.active {
          background-color: #F1F1F1;
          position: relative;
          &::before{
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #DD524D;
            position: absolute;
            top: 50%;
            left: 0px;
            transform: translateY(-50%);
          }
        }
        }
      }
    }
.right-scroll-view{
 .cate-lv2{
   font-size: 12px;
   font-weight: bolder;
   text-align: center;
   padding: 15px 0px;
 } 
}

.cate-lv3-list{
  display: flex; 
  flex-wrap: wrap;
  
  .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
}
</style>
